High-purity, energy-saving and environment-friendly smelting process for secondary lead

Abstract

A high-purity energy-saving and environment-friendly regenerated lead smelting technique comprises the following steps that (1) lead paster obtained by recycling waste lead-acid batteries is stacked in a unified mode, and the water content of the lead paster is controlled to range from 12% to 15%; (2) the lead paster obtained in the step (1) and a flux are mixed with the mass ratio being 100:(1-5), and the mixture is pelletized, so that lead paster pellets are obtained, and the lead paster pellets are fed into a smelting furnace via a feeding opening to be smelted; (3) the smelting furnace is heated with oxygen as fuel, the reaction temperature of the smelting furnace is controlled to range from 1260 DEG C to 1270 DEG C, and after high-temperature smelting in the smelting furnace, coarse lead, high-temperature smelted lead slag and flue gas with low SO2 concentration are generated; (4) smoke and fume are obtained after the flue gas with low SO2 concentration is cooled, the smoke is subjected to pelletizing and smelting again as the step (1) required, and dust and waste gas are obtained after processing the fume by a bag-type dust remover; and (5) the coarse lead is discharged out of a lead discharge outlet of the smelting furnace to form a cast ingot, and enriched copper dross, refined lead and anode mud are obtained by conducting pyro-refining and electrolytic refining on the coarse lead ingot.

Description

technical field [0001] The invention relates to the technical field of secondary lead smelting, in particular to a high-purity energy-saving and environment-friendly smelting process of secondary lead. Background technique [0002] At present, there are nearly 300 domestic recycled lead factories, but not many of them have a scale of tens of thousands of tons, and the average production capacity of small factories is about 1,000 tons per year. Domestic secondary lead manufacturers have small production scale and low technical level. Most manufacturers use small reverberatory furnaces for smelting, and some small enterprises and self-employed people even use primitive earthen furnaces and earthen kilns for smelting. The specific smelting method is: mix lead metal and lead slag ash into the kiln for smelting, a large amount of lead metal that can be melted at low temperature and cast lead slag are smelted at high temperature together, bituminous coal is used as fuel in the sme...

AI Technical Summary

Problems solved by technology

[0004] In recent years, China has introduced or independently developed mechanical crushing and sorting waste battery technology and equipment on a large scale, but there is no ideal treatment technology for carbonated lead paste. Among them, the imported short kiln failed due to the difficulty of process stability control. Example: The double-chamber energy-saving circular furnace independently developed in China has limited scale and high cost of single furnace; the side-blown furnace for direct lead smelting requires large investment, high process control requirements, and high energy consumption